package homework;
import java.util.Scanner;

public class Demo5 { public static void main(String[] args) {
    int[] arr = {19, 28, 37, 46, 50};
    System.out.println("请输入数据");
    Scanner in = new Scanner(System.in);
    int a = in.nextInt();
    for (int i = 0; i < arr.length; i++) {
        if (arr[i] == a) {
            System.out.println("索引值为"+i);
        }
        else{
            System.out.println("未找到索引");
            break;
        }
    }
}
}
